package com.hq.door.util;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.util.Random;

import javax.imageio.ImageIO;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;


public class imageCodeUntil {
    private static Random random = new Random();
    private static String randString = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";

    private static int width = 120;
    private static int height = 40;
    private static int lineSize = 80;
    private static int stringNum = 4;

   
    private static Font getFont() {
        return new Font("Fixedsys", Font.CENTER_BASELINE, 18);
    }

    private static Color getRandColor(int fc, int bc) {
        if (fc > 255)
            fc = 255;
        if (bc > 255)
            bc = 255;
        int r = fc + random.nextInt(bc - fc - 16);
        int g = fc + random.nextInt(bc - fc - 14);
        int b = fc + random.nextInt(bc - fc - 18);
        return new Color(r, g, b);
    }

    private static String drowString(Graphics g, String randomString, int i) {
        g.setFont(getFont());
        g.setColor(new Color(random.nextInt(101), random.nextInt(111), random
                .nextInt(121)));
        String rand = String.valueOf(getRandomString(random.nextInt(randString
                .length())));
        randomString += rand;
        g.translate(random.nextInt(3), random.nextInt(3));
        g.drawString(rand, 20 * i, 30);
        return randomString;
    }

    private static void drowLine(Graphics g) {
        int x = random.nextInt(width);
        int y = random.nextInt(height);
        int xl = random.nextInt(20);
        int yl = random.nextInt(25);
        g.drawLine(x, y, x + xl, y + yl);
    }

    public static String getRandomString(int num) {
        return String.valueOf(randString.charAt(num));
    }


    public static void getRandcode(HttpServletRequest request,HttpServletResponse response,String key) {


        BufferedImage image = new BufferedImage(width, height,BufferedImage.TYPE_INT_BGR);
        Graphics g = image.getGraphics();
        g.fillRect(0, 0, width, height);
        g.setFont(new Font("Times New Roman", Font.ROMAN_BASELINE, 18));
        g.setColor(getRandColor(110, 133));

        for (int i = 0; i <= lineSize; i++) {
            drowLine(g);
        }
    
        String randomString = "";
        for (int i = 1; i <= stringNum; i++) {
            randomString = drowString(g, randomString, i);
        }

   
        String sessionid = request.getSession().getId();
        request.getSession().setAttribute(sessionid+key, randomString);

        g.dispose();
        try {
            ByteArrayOutputStream tmp = new ByteArrayOutputStream();
            ImageIO.write(image, "png", tmp);
            tmp.close();
            Integer contentLength = tmp.size();
            response.setHeader("content-length", contentLength + "");
            response.getOutputStream().write(tmp.toByteArray());
        } catch (Exception e) {
            e.printStackTrace();
        }finally{
            try {
                response.getOutputStream().flush();
                response.getOutputStream().close();
            } catch (Exception e2) {
                e2.printStackTrace();
            }
        }
    }

}
